How to wire manifold heater plug on old fiat tractor

charliemack · 12-03-2013 11:26AM #1

Hi all. These cold mornings are starting to catch up on my old fiat 850 tractor. The heater plug dosn't seem to be working so i was wondering if it's possible to wire plug to a seperate switch and use it when needed.

12-03-2013 12:08PM

i am not sure i would need to look more at my 880 fiat , i think the heater has a little resveior of diesel that is heated before it enters the pump ,

bbam · 12-03-2013 03:00PM

charliemack wrote: »

Hi all. These cold mornings are starting to catch up on my old fiat 850 tractor. The heater plug dosn't seem to be working so i was wondering if it's possible to wire plug to a seperate switch and use it when needed.

Is the heater plug itself ok?
They do blow, I find 2-3 years is about their serviceable life anyway.

adne · 12-03-2013 05:41PM

bbam wrote: »

Is the heater plug itself ok?
They do blow, I find 2-3 years is about their serviceable life anyway.

How do u get at the heater plugs on the fiat?.

charliemack · 12-03-2013 09:12PM

This is antiques roadshow stuff

there are two heater plugs on the air intake manifold on top the engine. Im thinking they are supposed to heat the air before she shoots it up the pipe.

candor · 12-03-2013 10:24PM

Most heater plugs just have a switched live going the the plug, the body is grounded by the fact that it's in contact with the chassis.

If you want to put in a switch it would be a good idea to have it spring back to the off position, and use a relay.

charliemack · 12-03-2013 11:20PM

Will go with that plan candor. Thanks all

bbam · 12-03-2013 11:50PM

Many ignition switches will have a "heat" position just before the start position, this would be handy as it avoids a new switch, its worth checking yours..

Ours didn't but it doesn't turn over when in gear. I wired the heater plug onto the "start" position. I leave her in gear and turn the key to the start position for 20sec, nothing happens but the heater runs, knock her out of gear and then start, it has the added benefit that the heater continues to run as she is turning over but then goes off once the key is released..

f140 · 12-03-2013 11:59PM

the heater is actually one thing i never have to use in any of my tractors/digger. they will start first turn even in the fierce coldtwo years ago.

adne · 13-03-2013 10:49PM

f140 wrote: »

the heater is actually one thing i never have to use in any of my tractors/digger. they will start first turn even in the fierce coldtwo years ago.

Your a mighty man :P

iverjohnston · 14-03-2013 01:16PM

"Your a mighty man

"

In Fairness to F140, if there is enough in the battery for one good swing, an Iveco engine won't need heating.

How to wire manifold heater plug on old fiat tractor

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